148707821 has 2 divisors, whose sum is σ = 148707822. Its totient is φ = 148707820.

The previous prime is 148707809. The next prime is 148707829. The reversal of 148707821 is 128707841.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136562596 + 12145225 = 11686^2 + 3485^2 .

It is an emirp because it is prime and its reverse (128707841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 148707821 - 2¹⁰ = 148706797 is a prime.

It is a super-2 number, since 2×148707821² = 44228032053136082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148707829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74353910 + 74353911.

It is an arithmetic number, because the mean of its divisors is an integer number (74353911).

Almost surely, 2^148707821 is an apocalyptic number.

It is an amenable number.

148707821 is a deficient number, since it is larger than the sum of its proper divisors (1).

148707821 is an equidigital number, since it uses as much as digits as its factorization.

148707821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 38.

The square root of 148707821 is about 12194.5816246397. The cubic root of 148707821 is about 529.7991656299.

The spelling of 148707821 in words is "one hundred forty-eight million, seven hundred seven thousand, eight hundred twenty-one".